<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script type="text/javascript">
        //sessionStorage 会话存储，当前窗口有效
        //localStorage 持久化存储，永远有效，只要不删除
        function add() {

            sessionStorage.setItem("user","{'name':'zs','age':18}")
        }
        function del() {
            sessionStorage.removeItem("user")
        }
        function update() {
            sessionStorage.setItem("user","{'name':'ls','age':18}")
        }
        function get() {
            alert(sessionStorage.getItem("user"));
        }
        // function add() {
        //
        //     localStorage.setItem("user","{'name':'zs','age':18}")
        // }
        // function del() {
        //     localStorage.removeItem("user")
        // }
        // function update() {
        //     localStorage.setItem("user","{'name':'ls','age':18}")
        // }
        // function get() {
        //     alert(localStorage.getItem("user"));
        // }
    </script>
</head>
<body>
<input type="button" value="add" onclick="add()">
<input type="button" value="del" onclick="del()">
<input type="button" value="update" onclick="update()">
<input type="button" value="get" onclick="get()">

</body>
</html>